Recent questions tagged Linux

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linux - How can I force PHP to use the libiconv version of iconv instead of the CentOS-installed glibc version?

The code I'm working on runs perfectly on Windows XP and on Mac OS X. When testing it on CentOS (and on ... is a cross-post from: NullPointer.ph See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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741 views

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linux - Building ARM GNU Cross compiler

A similiar (less descriptive) post is here. I'm trying to roll my own tool chain using recent releases on ... /usr/local/arm-linux/include make See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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883 views

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linux - Why zombie processes exist?

Wikipedia says "A child process that terminates but is never waited on by its parent becomes a zombie process." I ... its parent" in this case? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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linux - Can eBPF modify the return value or parameters of a syscall?

To simulate some behavior I would like to attach a probe to a syscall and modify the return value when certain ... Is this possible with BPF? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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966 views

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linux - Extract email addresses from text file using regex with bash or command line

How can I grep out only the email address using a regex from a file with multiple lines similar to this. (a sql dump to ... [A-Z]{2,4}' file.csv See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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697 views

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linux - What would cause a java process to greatly exceed the Xmx or Xss limit?

I have 7 different java daemons that I run (all 7) on 3 different servers. The java command line has -Xmx2048m ... the case) the memory limits? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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linux - gdb does not hit any breakpoints when I run it from inside Docker container

The problem I am able to set and reach a breakpoint if I compile and run from the host, but if I do ... as suggested in yet another answer. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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860 views

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linux - Hadoop: require root's password after enter "start-all.sh"

I have installed Hadoop and SSH on my laptop. "ssh localhost" works fine. After formatting HDFS, I tried to ... anyone can help me? Thanks! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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linux - Building a simple (hello-world-esque) example of using ld's option -rpath with $ORIGIN

Note: Full working example now below. Original question follows: I'm having problems using ld's -rpath ... a complete working example? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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695 views

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linux - What is the use of $# in Bash

I am very new to Bash scripting, can someone explain to me how the $# and $? work in the following code? ... exist." exit $E_BADARGS fi exit $? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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750 views

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linux - Filtering Rows Based On Number of Columns with AWK

I have lines of data that contain single column and two columns. What I want to do is to extract lines that ... $2}' myfile.txt enter code here See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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770 views

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linux - Move the cursor in a C program

I'd like to move the cursor forward and backwards in a C program. I'm reading the whole line in a loop, ... (PROMPT) on the readline.h library See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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828 views

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linux - SVN: Ignoring an already committed file

I have a settings file that is under version control using subversion. Everybody has their own copy of this ... using linux command line svn. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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783 views

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linux - Using OpenGL Without X-Window System

How to OpenGL on Linux Platform Without X-Window System, can I send OpenGL Graphics Directly to Framebuffer Device? ... only have Linux driver. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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687 views

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linux - How much does using htaccess files slow down website performance (especially with solid state disks)?

The Apache docs say (http://httpd.apache.org/docs/2.4/howto/htaccess.html), "You should avoid using ... can be under particular circumstances. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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747 views

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linux - How to check HZ in the terminal?

I have seen this http://kaasxxx.wordpress.com/2008/01/22/linux-hz-checker/ But the script seems not to work. ... HZ" in the terminal in Linux? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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742 views

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linux - Using output of awk to run command

I am brand new to shell scripting and cannot seem to figure out this seemingly simple task. I have a text ... awk being appended after -cipher? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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748 views

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linux - After using `exec 1>file`, how can I stop this redirection of the STDOUT to file and restore the normal operation of STDOUT?

I am a newbie in shell scripting and I am using Ubuntu-11.10. In the terminal after using exec 1>file command, whatever ... exec 1>&- exec 2>&-? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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701 views

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linux - Add a header to a tab delimited file

I'd like to add a header to a tab-delimited file but I am not sure how to do it in one line in linux ... . not familiar at all with perl though. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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737 views

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linux - Extract list of file names in a zip archive when `unzip -l`

When I do unzip -l zipfilename, I see 1295627 08-22-11 07:10 A.pdf 473980 08-22-11 07:10 B.pdf ... I ... don't think the delimiter is just " ". See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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752 views

1 answer

linux - NUMA aware cache aligned memory allocation

In linux systems, pthreads library provides us a function (posix_memalign) for cache alignment to prevent false sharing. And ... can I do this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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731 views

1 answer

linux - Unzip a bunch of zips into their own directories

I have a bunch of zip files I want to unzip in Linux into their own directory. For example: a1.zip a2.zip b1 ... there any easy way to do this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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907 views

1 answer

linux - Using grep to find all emails

How to properly construct regular expression for "grep" linux program, to find all email in, say /etc ... [email protected]" Help ! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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823 views

1 answer

linux - Behavior of cd/bash on symbolic links

Assume I have the folders ~/a/b in my home folder, and the folder b contains a symbolic link to '..' named ' ... at the end, and not /home/hm? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.1k views

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linux - /usr/bin/perl: bad interpreter: Text file busy

This is a new one for me: What does this error indicate? /usr/bin/perl: bad interpreter: Text file busy There ... 9.04, file system is ext3. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.0k views

1 answer

linux - ERROR 2003 (HY000): Can't connect to MySQL server (111)

This question is related to the following questions: Can't connect to MySQL server error 111 Trying to connect ... closed by foreign host. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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809 views

1 answer

linux - How to check if a shell command exists from PHP

I need something like this in php: If (!command_exists('makemiracle')) { print 'no miracles'; return FALSE; } ... ); } Are there any solutions? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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648 views

1 answer

linux - set-up X11 Forwarding over ssh

I'm attempting to set up x11 forwarding to monitor video on an embedded robotics platform yet I cannot seem to get ... no avail. Thanks a lot! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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